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Evil Mad Scientist Laboratories write -

Here's a cheap and easy way to deal with getting rid of pesky reflections, shadows and backgrounds in your small object photography: use a lampshade for a light tent.
This $6 lampshade from IKEA is white, nearly cylindrical, and has an adjustable (removable) mounting bracket, all of which make it easily adaptable to this purpose.

Illuminating light tents @ MAKE

PVC Light box / light tent - Link.

Make your own Light tent - Link.

DIY light box - Link.

Cheap 1$ light tent / light box - Link.

HOW TO - Make a super simple light tent - Link.

HOW TO - Make an Ikea hamper light tent - Link.

Budget photographic lighting "tent" - in a bucket - Link.

HOW TO: Take better photos with a $10 light tent - Link.

Copper light box / light tent - Link.