The Graphics Fairy Spring Printable inspired these very-easy-to-make fridge magnets.
All you need is a print out of the bugs and butterflies (at the above link) at a size suitable for your glass pebbles, (I used high resolution paper for printing to stop colour bleed); some good, clear-drying glue, scissors, pencil, and one small, round magnet for each pebble.
Using the pencil, trace pebble shape around selected bug/butterfly, cut out paper shape of image and with image facing up, glue shape to back of glass pebble eliminating air bubbles if they occur. Once the glue/paper is dry, glue magnet to back of pebble, allow to dry completely and that's it.
What could be simpler?
Linking to Brag Monday at the Graphics Fairy.