here's some pictures of my lite brite table.
i found this old table at a yard sale, and just screwed a piece of painted pegboard to it.
the table was like a box with one corner cut off, which is where the pegboard is.
i put a fluorescent cabinet light under the pegboard, the covered the open sides with black craft foam.
this is a picture in the dark on valentine's day.
the board i am using is only 17x17, so i can change the picture often without too much effort. i dont have plexiglass over it, because i just use the other parts of the table, but i can easily put down books, magazines, or other flat things over the lite brite pegs with out messing anything up.