...that I made for the bedroom:
1. Wood-grained circles: A while back, we picked up a free particle-board bookshelf that a neighbor had set out by the curb. The back side of it was a piece of very thin corrugated cardboard, with a bleached wood grain pattern printed on it. This back piece had fallen off, and the recipient of the bookshelf didn't want it repaired, but I thought I might be able to use it for a project...maybe. I am getting pickier about my materials as I get older, and I nearly threw this one away.
The bedroom has developed a bit of an outer space theme, at least in its upper half, and I had the idea of using the cardboard to make "planets"...simple circles, which with the wood grain turned sideways would resemble Jupiter. I had a lamp shining up the wall right where some previous owners had made a sloppy patch job, and I wanted something else there to look at.
I cut out four circles, after tracing around a bowl, and ended up using three of them. I burnished the edges a little, to round the edges over slightly and make them look a little less two-dimensional. (Burnishing means to rub something with something that is smooth and harder.) I attached them to the wall with double-sided tape; ours is rather old, so I don't think it will harm the paint.
2. Cloudy night sky in a jar: I was looking for something that is cobalt blue, to put in the bedroom as an accent piece, and remembered that I had a short cobalt glass jar. Then I thought that it needed something in it, and grabbed a couple of pieces of tissue paper I had saved; white and pink. I stuffed the white piece in first, then the pink, screwed on the lid, and flipped it over. The result looks a lot like clouds at night. The cobalt color is very intense, but so far I like it.