OK, this should work.
Fist you should probably make a backup of the original file. Got to "my computer", then into your C drive, and find the programs folder. Inside there you should see your virtual villagers folder. Open that up, and go into the images folder. Find the file called collectible_images, and copy that somewhere else safe on your computer, then you can get rid of the original one. Then save this image over the old collectibles file.
