OK, I haven't tested this, and it's not very much like Carcassonne in terms of scoring, but it sure looks like fun. Anyone want to test run it for me? It probably needs a tweak.
2 decks cards, 7 tokens for each player
Mix the cards, place one face up on the table, and remove 11-13 other cards without looking at them (there must be an equal number in the draw deck for all players). Each player draws three cards and looks at them. Each player takes 7 tokens.
You can vary the length of the game by removing more or less cards. You can make easier or tougher game by giving players more or less tokens.
Players take turns, in clockwise order. On your turn, a) play a card onto the board, b) place a token onto the played card, c) score completed or partially completed areas, and d) draw a card.
Playing a card: All cards played must touch orthogonally at least one other card on the table. You may place any card so that it touches only a single other card of any suit. You may place any card so that it touches only other cards of the same suit. To place a card that touches more than one card of different suits, the placed card must be numerically equal to or higher than the lowest number on any of these cards, and equal to or lower than the highest number of any of these cards.
Areas: An area is defined as a set of 1 or more cards, all of the same suit, all touching orthogonally. An area is complete if all spaces orthogonal to all cards in the area are filled by cards of the other suits. An area is partially complete if the number of empty spaces orthogonal to the cards in the area is equal to or less than the number of cards in the area.
Placing a token: You may only place a token on the card you just played. You may not place your token into an area that already contains a token. Additional tokens may become part of an area that already contains a token if two separate areas are merged through one or more placed cards.
Scoring areas: You may score any area that is partially complete. You must score any area that is complete. You score 3 points for placing the card that creates a completed area (for each completed area).
When scored, an area scores points for the players who own tokens on an area. All tokens in the area score these points (so double if you have two tokens). The score is 1 point per card in the area if the area contains 2 or fewer cards, otherwise 2 points per card in the area. All tokens that score are returned to the players (this is not optional); this is the only way to get back placed tokens. A token can be placed on a card, score, and be returned on the same turn. One area can score multiple times in a game.
At the end of the game, players score 3 points each for any tokens they have on the board that are on face cards (J, Q, K, and A).