I used the foam cuase I was striving for a naturalistic look. But I wish I had used something like epiweb or tree fern panel ontop of it to give it some substance for the orchids. So maybe you aught to try that.
To get rid of the yellow of Greatstuff you smear black or brown silicone all over it. The silicone covers the yellow and allows you to glue tree fern panel or whatever to the foam. An alternative to Great Stuff is Handi Foam which comes in black, and is what I used. Good Luck!
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All that is gold does not glitter,
Not all those who wander are lost;
The old that is strong does not wither,
Deep roots are not reached by the frost.
-J.R.R. Tolkien, LOTR, Fellowship of the Ring
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