How to make custom LEGO signs, newspapers, etc. I have several ideas, but I am finding it hard to get started. What I am interested in is making my own decals for signs, newspapers, artwork for the walls and others. So far I haven't had any luck.  Is there a site that has LEGO clip art backgrounds, lettering, etc.?
Well I don't exactly know what you mean buy a sign like one that he/her can hold or a sign in the ground? Moving onto the newspaper you can get white sticky clay and get two white 6x5 pieces or a size you like and fill in the crack in the middle then put one piece of clay in the Lego persons hand and shape it in a Lego rectangle size
 Hope this helped