What version of Premiere Elements and on what computer operating system is it running? Have you explored fully the Premiere Elements Clip Arts/Graphics?
I do not have a recommended source for animated files for your video. However, a Google Search seems to bring up several web sites with offerings once your enter Animated Clips in the Search field of your default browser You would need to explore the animated formats that are being offered. The animated Premiere Elements graphics appears to use as its core file an .swf file.