I have several different kinds of clips that I have made, but right now I'm only going to show the clips I made using silk flowers.
And the secret ingredient: cabinet lining. You can buy this in large amounts at any place like Bed Bath & Beyond.
See, you cut it into thin little 1" strips, and when you glue that inside the clip it will help "grip" the hair with out being uncomfortable
Once you've picked your ribbon and flower, you start by using your hot glue gun to glue the ribbon onto the hair clip.
Then take your flower(s) and glue them down one by one
I recommend always using more than one single flower, layering the flowers is just much prettier.
When You've got the flowers on, add something to the center, most often I use small jewels, but buttons, brads, beads, etc... will work
Then also glue the strip of lining inside the clip to finish it off.
Larger flowers cover the ribbon so you don't need to get as picky (there are a few very large flowers that I used no ribbon at all)