The best way to get a lace print onto a fingernail is with an airbrush. If you're not ready to invest in that kind of equipment just yet, this method will generate some pretty nice looking results.
Seed beads are a versatile and super fun craft material. Don't let the tiny beads intimidate you. Start with small eggs and work up to larger projects. I make up my patterns as I go, but you could also make up a chart and plan that in advance.