I Iike to play with my photos by inserting clip art people and giving them captions. These simple cartoons make amusing cards - just print the photo and paste it onto card stock. Adding captions or poetry to the photo before printing makes it simple to assemble.
I like to add my own poems or humorous language but you could just as easily insert well-loved quotes or sentiments appropriate for the recipient.
Have fun with it if you want to give this idea a try. Take photos of landscapes or flowers without people in them (close ups of flowering shrubs work well). Use a photo editing program like Photoshop Elements to layer in clip art people or animals. In some cases you might have to erase backgrounds around the figure so they look as if they're standing in your photo instead.
Create thought balloons over their heads for a caption. Juxtapose old-fashioned ladies and gentlemen with funny or modern thoughts. Tint their clothing, add blush and lip gloss if you wish (super funny on the men).
The Graphics Fairy is a good source of free clip art or look up Dover publications at your library. Many of the Dover books come with clip art on CD. My photos here combine Dover images with insects from The Graphic Fairy. I digitally colored the figures and altered their size to fit the photos.
Clip art is a great way to get a second use from all those vacation shots you took. Turn last year's beach photos into pirate wars or mermaid landings for a child's birthday card. Jazz up your garden shots with courting ladies and gentlemen. Send someone in need of cheer a crabby Victorian in a neon dress. Have fun!