You're a manager at a local service company renowned for its top-notch customer service. Your Customer Service Representatives (CSRs) interact directly with potential customers and play a vital role in driving sales. They're also part of a spiff program, where they earn immediate bonuses for sales. Based on this information, could you propose five creative spiff program ideas to further incentivize your CSRs and enhance sales? Also, suggest how each of these programs could effectively lead to increased sales.

[The more specific context you can provide the better.]