Something with defeating creepers/skeletions, or a wave, like that. Monster are often a bit "creepy" so they fit good already within your map. Try to create very dark environments, even when it is day. Caves are a good solution or creepy, dark temples with monsterspawners
Well I'm sure you specified you are "looking" for a server to build on and that relates to the "server-section". However I agree with you on where to put your topic then in if you're want to "build" on a server (as a request, not as like you own a server). So there is a bit confusing here..
It is like some kind of horror-like map? Otherwise add some pumpkins and make creepy objects to decorate your environment. Just play around.
P.s.: Maybe if you add some screenshots of what you already made it is more easy for people to help you giving some interesting idea's ya know (Then it is even more a showoff, if you talk about the board you're posting in hehe)
Thanks! The Tower of Challenges and the Palace of Symmetry are already downloadable if you're interested. Only the Palace has to get some enhancements like a glass dome on top of the structure.
If you're looking for a server then you may have posted on the wrong board. This link to the board "Servers" describes more of your intention: gamesprays-gaming-servers.html
I use Gimp2, works pretty fine if you know what options to use. (It's like photoshop)
You can use another recourcepack as a template, then use Gimp2 or any other program you prefer to create the textures, etc.
Just what vivaminecraft said, it depends on the detail and what resolution you want to use. Common resolutions are x16, x32, x64, x256 and x512 pixels. I would recommend one the first three resolutions.
Well as far as I know I have lightning problems sometimes when new chucks are generated. Black shadows come up but disappear when you come close. I also have this sometimes when I imported a MCEdit schematic into another world.
Slabs places upside down also cause lightning bugs.
I think these bugs are a already common known issue after all