Lord Lego 436 wrote:It mostly turns up with really fancy castles, though.

So build a really fancy castle then!
If you've no ideas on design or layout just build, see what happens. If it's a mess, fine, but this is Lego so you can start over. Either way it's all experience. If you're completely stumped, consider real life castles. Google them, visit them, observe the ones in films or videogames. If that's out of the question for whatever reason just see what everyone else is doing and start from there. The recent
32 stud challenge plenty of inspiration and variation, and best of all, shows how little a footprint is needed to make something great.