If you need to buy new plates and covers, know that they are cheap. Plastic models in the store are sometimes priced as low as 25 cents each.
Instead of decoupaging (a popular approach to this craft) we bought four rolls of tape. Between store sales and some coupons, they're less than $8! The two printed rolls are from Smash and the two glittery tape rolls were made by Recollections. They're all full of personality, and even if they're not complementary to each other, they sure do come across as a fun bunch.
To get mad. I created a few that were all sparkly, a few that combined glittery ribbons and patterns, and one that was solid polka dots.
Place at least 1/2" of the tape around the back of the cover, paying no attention to how the tape covers the access holes and screw holes. Once the plate is completely covered, use a blade to cut clogged tape.
The rhinestones ended up being my favorite and are an instant hit in this little girl's room.