Old Ale
Strong Scotch Ale
Barleywine (English or American)
Russian Imperial Stout
Plenty of others to pick from... I've made a solid Old Ale, at about 8.1% ABV, and have a Strong Scotch Ale that's about to get moved onto some oak cubes.
I tend to make stronger beers as my baseline, most in the 5-6.5% ABV range. A few have traveled into the 7%-9%+ range... I am formulating a decent English barleywine to be started soon... Should be in the 11.5%+ range...
Just be aware, that bigger brews (high OG's) will take longer to ferment, most often need to age for a span, and then tend to take longer to carbonate (especially when bottled)... As long as you plan for all that, you'll be fine.