Yes bases can be a problem.
I have used, with varying degrees of success:-
Plastic/wood picture frames
Turned wood
Craftwood bases from the local cheap shopvarying sizes and shapes from $1 to $5 that can be either stained or painted
A tea pot stand! My wife never did find where it went!
Jar tops (plastic).
I scrounge around second hand shops and some socalled antique shops for other bibs and bobs that might come in useful. eg the dome case of an old clock and a rectangular plastic fish tank.
look at things and see what you can do with them.
Dai