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To apply a different texture to each side of an object, do the following:

1) Right click on the object and select Edit.

2) Click on Select Texture (which is under Stretch)

3) Click on the side of the object you want to change. If you want to do more than one side at a time, hold down shift and select the sides.

4) Click on the Texture tab and apply texture/color/transparency as normal - it will only apply to the selected side(s).

http://www.thedoormouse.com/cgi-bin/Store/store.cgi

(Fabric textures)

http://perso.club-internet.fr/lemog/lemog_textures/acc_textures01.html

(3400 textures, in French and mostly english - very comprehensive and unusual textures broken down into categories)