Link to the build: Rogue X
I love playing with Rogue builds, but I'm not patient enough for detailed min-max work (mostly don't have the items anyway). I do love themes, though. So when I decided to prestige Rogue, I wanted to pick a theme to build around. I did fire already, so I figured I'd change it up this time through.
At first I was going to do an alien theme, but it turns out that it's kind of hard to do that at low levels. A lot of the aliens are high level in the game. So I decided on X-Men instead. Those are easy to find as you progress through the story, and of course it fits nicely with Rogue.
Stolen/Borrowed powers are all from X-Men members or enemies: Cyclops, Jean Grey, Gambit, Storm, Kitty, Iceman, Colossus, Pyro, and Lady Deathsrike. And I use Wolverine as my team-up, primarily for the passives.
I wasn't able to find a good theme fit for my Legendary item. The M'Kraan Crystal is the closest, I suppose. But I already had a Power Cosmic so I just kept that. Outside of that, though, I think all the items are themed either to X-Men or their enemies. Same with the Omega nodes, and Synergies.
This build won't be challenging for any DPS crowns, but it does just fine in most level 60 content. The area damage is great, so it works well in patrol zones and cosmic terminals. Single-target damage isn't great, so it's probably not something to take into higher-end raids, but it's fine for cosmic bosses, Ultron runs, one-shots, etc.
This certainly isn't the only way to build an X-Men themed Rogue, so feel free to suggest improvements or alternatives!