Any suggestions for mid to higher level play? We're getting pretty close to finishing up the Red Hand of Doom and are looking for something to continue our adventures on afterward that may be similarly themed, mainly facing down chromatic dragon plots. We should be level 12 or so upon completion.
If you were higher level I'd have said to do the War of Dragons one, but that's better for 18th level, although you could probably scale that one down some.
There's a Classic Dungeon Crawl called Lost Tomb of the Sphinx Queen. It's meant for 14-15 level, but again you could adjust it a bit for them, and adapt it for a dragon instead of a queen sphinx.
Don't really know too many dragon specific ones.
You could do something a little different. Did any of the dragons survive? Or many perhaps the dragons have heard of them by now, and want them out of their way so they too don't follow in their brethren's steps. In which case, have an assassin squad go after them with the adventure An Eye For An Eye, and have them take on the mercenaries the Council of Wrath. It's originally meant for 8th level characters, but you could easily advanced them all a few levels. It'd likely catch them off guard. Fighting dragons for so long and now they have to get into a regular fight with another group, who's slowly trying to break them up, and ruin their reputation at the same time, all because they took on X number of dragons and ruined their plots.