A cheap way to create accent lighting with a camera flash is gels. Roscolux and Lee have sample gel books for people to see what gels they sell. I saw someone using these gel samples on a flash for accent lighting. I created a holder for these sample gels to keep them away from the flash lens surface so they won't melt and deform as quickly.

Personally I have some Godox Flashes but Flashpoint Flashes are also Godox flashes that are rebranded. If you have Flashpoint flashes, look up Godox TT350 to see if it is the same kind or the same shape for the flash end.

The design is a side load so you can use either the Lee samples or the Roscolux samples. Link for the samplebooks is below

Link for the Roscolux gel book: https://www.filmandvideolighting.com/rorosw.html
Link for the Lee gel book: https://www.filmandvideolighting.com/lee-filters-lighting-gels-swatchbook.html

The sample books can be found in other places and as long as it is the same book the holder should work but this is where I got the sample books. They are on Amazon for a higher price but they are available.