I posted pics of my Transdimensional adventurer dude a couple weeks ago, but unless there's a clue all he is is a guy with guns. So, I give you the fireplace with a transdimensional portal! Almost done, just need to add some knicknacks to the mantle. And maybe, thinking of it anyway, bringing the other world into the fireplace by making up a some terrain- grass and flora in front of the painted scene.
Backlighted in the dark, doesn't look as good as I thought it would:
I painted the other world on a piece of clear plastic then oversprayed it with light blue. My 1st time attempting to paint landscapes. I showed it to my wife and she exclaimed "Oh! Did you make that in 5th grade?" I busted out laughing "No. The paint is still wet!"