I have a "smoker's kit" that came with a previous car. It is a cup shaped thing with a hinged spring loaded lid that flips down to close it. It is designed to be an ashtray. It fits nicely in the rear cup holder and holds my change. I don't know if these are available anywhere but it works well for the purpose. I guess you could just use a short cup in the holder too.
OK< this is what I do for parking meter change - I bought one of those $2 zippered little pouches from the men's wallet section of Wallmart - it is black, zips shut, is about 3.5" x 3" and easily holds about $25 worth of change. Keeps it from rattling around and easily available. I keep it in the center console in the little tray, but it could be kept anywhere. Works great for me.
Don't put it in the front cup holder which opens. I did, and a quarter was stuck for a few days. I couldn't open the holder and wrote to the forum for help. Almost dismantled the assembly and was ready to seek help from dealer. Now I just use the open cup holder or felt compartment.