Some web sites to help you express yourself:
Start with a visit to jacksonpollack.org; this should get you in the mood. (You can see some genuine Pollocks here.)
Slightly less abstract is the wonderful Mr Picasso Head complete with Picasson style signature.
Art Pad is a clever Paint-style application which allows you to regress to childhood and enjoy slapping paint onto paper, albeit in a virtual manner.
And finally, go here and download the freeware version of Art Rage2, a truly fabulous painting program which allows you to work with paint that behaves and looks remarkably realistic. The longer you drag the mouse without releasing it, the less paint remains on the brush. Painting one colour over another results in satifsying (or annoying) smudging between the different colours. I am just about to upgrade to the full version which promises glitter, metallic paints and other goodies!
Release you inner child, create and express yourself, and no-one will tell you to wash the paint pots afterwards!
This posting released under the terms and conditions of my half-term pledge. Normal service will be resumed on 30th October.