After learning functional programming in Haskell and F#, the OOP paradigm seems ass-backwards with classes, interfaces, objects. Which aspects of FP can I bring to work that my co-workers can understand? Are any FP styles worth talking to my boss about retraining my team so that we can use them?

Possible aspects of FP:

• Immutability
• Partial Application and Currying
• First Class Functions (function pointers / Functional Objects / Strategy Pattern)
• Lazy Evaluation (and Monads)
• Pure Functions (no side effects)
• Expressions (vs. Statements - each line of code produces a value instead of, or in addition to causing side effects)
• Recursion
• Pattern Matching

Is it a free-for-all where we can do whatever the programming language supports to the limit that language supports it? Or is there a better guideline?