Hi! I've made my own creme de violette with flowers I grew. It took a LOT of violets, wasn't as nice a color as the commercial stuff, and came out a little bitter.
HOWEVER.
I have also made cheater creme de violette using candied violet petals that came out AMAZING. It was cheap and incredibly easy. Everclear, violets, water down to desired strength, sweeten to taste. Aviations fer days.
When life gives you crystallized violets make creme de violette
http://juniperdiaries.co.uk/gin-recipes/home-made-creme-de-violette-part-one/