A few weeks ago
David of Tropical Texana posted results of testing free online collage formats. One of his collages reminded me of my favorite effect in
Fotoflexer. It's the "pop-art" effect which will turn your photos into a Andy Warhol style masterpiece in seconds. I played with several photos and my favorite is this agave.
Printed out on poster paper or canvas it would be a fun piece for a wall.