heres a small parameter pack with 4 different flames in it (the ones you are looking at).
I tried to make them as basic as possible but still visually apealing somehow xD. so you can tweak it in a less standard way.
what these flames have in common is the colouring in the bubble and cylinders (using some xaos). no direct colouring or something. in the cylinders i just put cylinder splits for example.
It's a technique i sometimes use but havent seen many other people doing so this might encourage you
enjoy have fun tweaking and stuff and remember DO tweak dont just submit (but i hope you are all mature and all to know so).
oh and ps if you made something notify me i would love to see it
ps. for the julian smartcrop is needed. and if it says lshear is missing ignore that xD