Try the "Billy Joel" test. Billy Joel taught a class. He talked about a song he wrote. Originally he thought of it as a Reggae song (which he demonstrated), but then thought of it as broadway (demo), then country (demo), the rock (demo)... same song, different style, and he could do it on the fly.

So can you write an algorithm (e.g. search, sort, regex) in recursive style, OO-style, table-driven style, procedural style, functional style, domain-specific language style, etc.? Does the stylistic change flow off your fingers?