Can I get a little fan fiction help...?

I've been dying to write a PJO chaptered fanfic for ages but I can't pezzo, hunk of anything! So, could te guys give me a prompt, like a little nudge? It could be:
first lines
pictures
brief ideas
fill-in-the-blanks
whatifs
quest ideas
o anything else te can think of!
I won't exactly use the entire idea, I'll just take inspiration from IT. I need an action/adventure fanfic prompt (no romance please) with no slash, AU/OC elements o fanon references. Just a nice little idea, not above T.
Thanks, and you'll get credit when I start the story :)
Remember, it's a PROMPT, not a whole idea...maybe a small quote o small synopsis o anything but not a FULL IDEA.
te can include Gods and it'll take place after TLO just no made-up pairings (Thaluke, Thalico etc) o whatever. Maybe a quest idea, who knows?
Thanks for your help and props will be dato out to everyone who risposte :)