I've been building an led fake yule log for christmas out of flickering/std leds. getting it to look right is hard, part of a real fire flickers; red,blue,yellow, and some is constant. so I've got series/parallel strings of leds, controlled by flickering ones. And some logic gates to sequence the growth to burnup process. A counter chip, a 154 decoder, and a box of surplus leds,all on an 11x17 perfboard. All from amazon.
Last night I got a flickering led to clock the counter, so now it's all just getting the leds right.
Yes, I'm a geek,lol.
Merry Christmas!