intel onboard graphics usually are bare minimum, just enough to run simplistic games, lol. you should be able to run openjk with low level settings. there isnt any opengl support that i can see with intel onboard video using windows. if you setup just a small linux partition with 50 gb's, you should be able to run jka better using openjk.
there shouldnt be a specific theme. if this is a pass around map, i think it would be nice to just let everyone make an addition that represents them. a true salute to the jk community