For years I've avoided using hex-grids for my dungeon and castle maps using them mostly for outdoors adventuring and some caves. You just can't get rooms with 90 degree angles to look right, or so I thought.
Poking about the web I came across some maps for the old board game Cry Havoc ! Some of the Cry Havoc ! maps had some pretty decent looking buildings with right hand angles, on a hex grid. This is something I'd always felt was a no-go and just simply wouldn't work. Well I was wrong.
Here is a map I whipped up, it doesn't take advantage of hexes all that much but does clearly show one can very easily map a dungeon with right angles on hex-grids.
Very little wasted space on "unused" hexes. The right angles don't look wrong. I'm certainly going to have to work up some dungeon levels that use hex-grids and take advantage of the hexes more after working this up.