(Warning: this method creates dangerous gas).Take two large bits of styrofoam/polystyrene ...a day when your GF or wife is not home.

Go somewhere safe (on a sink or basin), outside the house – or open all windows; wear gloves, send the cat and kids away, etc.
Pour a spoonful of acetone on each piece of polystyrene.
The surface of the polystyrene will begin to melt.
Press the two bits of polystyrene together while it's melting.
Separate them gently (no more than 10 cm).
Put them in cold water to stop the melting.
The effect is stunning; and it can easily be cut and painted.
http://argad.forumculture.net/t1077-tuto-toiles-d-araignees