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The categories and mechanisms Rick uses in his published games (not counting expansions), sorted by frequency.
CATEGORY
6 Ancient
6 Economic
4 Political
3 Negotiation
3 Wargame
2 Civilization
2 Dice
2 Exploration
2 Territory Building
2 Trains
1 Fantasy
1 Industry / Manufacturing
1 Napoleonic
1 Nautical
1 Post-Napoleonic
1 Prehistoric
1 Science Fiction
1 Transportation
1 Travel
MECHANISM
5 Card Drafting
5 Variable Player Powers
4 Auction/Bidding
4 Dice Rolling
4 Simulation
4 Voting
3 Modular Board
3 Push Your Luck
2 Network and Route Building
2 Pick-up and Deliver
2 Variable Phase Order
1 Area Movement
1 Commodity Speculation
1 Crayon Rail System
1 Deck, Bag, and Pool Building
1 Events
1 Hand Management
1 Hexagon Grid
1 Income
1 Point to Point Movement
1 Set Collection
1 Simultaneous Action Selection
1 Trading