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I'm also using glass but I never end up with something useful!

That is a great Idea to use a glass and it looks really nice. I do not know how about you but one of the Russian Impressionist Igor Sakharov uses canvas as palette for his Oil painting and at the end depending on how it looks like also frames them as abstract.

yes, that is a good idea as well, and as a matter of fact, now that you mention it, I've done so myself, using a small panel instead, which later I just added a few things to.