This is what I came up with for the challenge.
I stamped Flourish Tree from Rubbernecker Stamps and then added punched flowers in rainbow colors each with a matching rhinestone in the center. I colored clear rhinestones with alcohol markers to get the colors I wanted for the flowers. I used a sentiment stamp from Studio G and a Spectrum Kaleidacolor stamp pad from Tsukineko. I added some black twine to finish it off.
Card measures 4.5" x 4.5: