Don't know what to get the kids in your life for Christmas this year? Well it turns out that little people get the biggest thrill out of getting geeky gifts - particularly gifts you do stuff with. So, if you're stuck on what to get your niece, nephew, friend, or even your own little person, take a look at our gift suggestions below.

We have organized them from the least to the most expensive, and give you 17 gift ideas for tweens and teens.

1. Fizzy Bath Bomb Factory

This kit lets kids investigate the science of fizz by creating their own bath bombs, haunted balloons, and volcanoes using simple ingredients like glycerine, cornstarch, and food coloring.

Recommended Age: 10+
Price Tag: $14.95

2. The Brew Your Own Root Beer Kit

This easy to use kit lets kids brew up 4 gallons of old fashion root beer naturally carbonated with real yeast.

Recommended Age: 8+
Price Tag: $17.95

3. DIY Sour Candy Factory Kit

From sour lollipops to sour gummies, to straight up sour liquids and powders, kids will love every minute of creating their own candy. The activity guide has recipes as well as candy, science, and candy-science facts.

Recommended age: 8+
Price Tag: $19.99

4. Code Breaker Card Game

For the future cryptographer, this code making/breaking card game asks kids to decipher code words used by opponents on the back of cards. Eighteen sets of matching cards are spread face down and flipped over two at a time. One is revealed to all players, the other is kept private, marked for future reference by the player. Opponents need to break codes and swipe matched pairs.

Recommended Age: 7+
Price Tag: $19.95

5. RockStar

RockStar is a hub for connecting up to five sets of headphones to the same MP3 player, making it possible for kids share a music player without having to share earphones.

Price Tag: $20

6. Fly Stick Van de Graaff Levitation Wand

This battery powered wand features a mini Van de Graaff generator that lets kids create the illusion of levitation. By pushing a button on the handle, the static charge built up in the wand causes the 3D mylar shapes to move around.

Note: You have to check out the video below to fully appreciate this toy [Dur: 1 minute 28 seconds]

Price Tag: $26.99

7. Darth Vader Mugshot T-shirt

Sizes: S - 2XL
Price Tag: $29.95

8. See Me Work Auto Stapler

A fully automatic stapler with transparent casing that reveals the secrets behind stapler technology.

Price Tag: $32.00

9. R/C Animated Solar System Mobile

Kids that dream of turning to astronomy when they get older can start now by exploring the wonders of the solar system in their own room. This animated solar system mobile shows the planets in orbit around the sun. A CD and light pointer is included to help guide them around the solar system.

Recommended Age: 7+
Price Tag: $39.99

10. WowWee's FlyTech Bladestar

The Bladestar is an indoor flying machine that includes a navigation sensor to help keep it from slamming into walls and ceilings. Multiple Bladestars can engage in living-room aerial battles.

Price tag: $40
Recommended Age: 8+

11. Guitar Hero and Rock Band Guitars by Aly and AJ

For kids who love Guitar Hero or Rock Band, these guitars are the ultimate fashion accessory. Designed by the teen pop stars Aly and AJ, these guitars work on the Wii and the PS2.

Price: $49.99

12. Bicycle iPod Speaker

For future rock stars, instead of cycling with earphones, keep kids safe with this water-resistant iPod speaker that clamps directly to their bike frame. A handlebar mounted remote control keeps things safe too.

Price: $50
13. The Roll Up Drum Kit

For budding musicians, this roll up drum kit has six sensor pads that plug into the USB port of PCs running Windows XP or Vista. Software is included letting kids choose from six different drum kits, 48 rhythm patterns, eight special drum effects, and eight bass drum loops. Each pad may be programmed with different effects. Kids can record and play their own riffs.

Price Tag: $59.95

14. Customizable Remote Controlled Robot

This customizable, remote-controlled robot kit has 105 interchangeable parts that enable kids to build limitless motorized robots with flashing lights, mechanical claws, and a rolling base. A color-coded, step-by-step manual is included for building four robots, or kids can just make up their own.

Recommended Age: 5+
Price Tag: $59.95

15. Perfume Science Experiment Kit

The Perfume Science Experiment Kit teaches kids how the nose works with their brain to recognize smells. Perfume oils, decorative flacons and other important tools of the trade are included with a full-color manual to help kids design and discover how perfumes are composed.

Recommended Age: 10+
Price Tag: $59.95

16. Electronics Workshop for Beginners

A unique introduction to electronics for kids who follow the story of Robert M-3, a young robot in the year 2069, who is beginning his education in electronics with an apprenticeship to Sirius Armstrong, the chief electrical engineer on an enormous space station orbiting Earth. As kids read about Robert's lessons in electronics, they will conduct experiments alongside him using the Electronics Workshop console.

Recommended Age: 10+
Price Tag: $110

17. Flip Ultra Camcorder

For the filmmaker of the future, the Flip Ultra is considered the world's easiest camcorder to use.

Price Tag: $149.99

We hope this list gives you some inspiration in this busy time.

If you know of any other great gift ideas for kids, please share them with us.

Many thanks to the wonderful folks that inspired this post:

Geeks are sexy
Geek Sugar
Scientific American
Swiss Miss
Think Geek