There's a ReadMe which contains the text that needs to be pasted into your current markings.cfg file.
Feline Body:
Spades;fmarkSpadesBody.png
Clubs;fmarkClubsBody.png
Hearts;fmarkHeartsBody.png
Diamonds;fmarkDiamondsBody.png
Joker;fmarkJokerBody.png
Smudge;fmarkSmudgeBody.png
Classic Tabby;fmarkCTabbyBody.png
Mackerel Tabby;fmarkMTabbyBody.png
Ticked Tabby;fmarkTTabbyBody.png
Spotted Tabby;fmarkSTabbyBody.png
Bicolour Tabby;fmarkBTabbyBody.png
Tuxedo;fmarkTuxBody.png
Gryphon;fmarkGryphBody.png
Gryphon 2;fmarkGryph2Body.png
Dapples;fmarkDapplesBody.png
Appaloosa;fmarkAppaloosaBody.png
Creature;fmarkFrankenBody.png
Herring Bone;fmarkHerringBody.png
Zira Stripe;fmarkZiraBody.png
Fading Rings;fmarkRingsBody.png
Dots;fmarkDotsBody.png
Stockings;fmarkStockingsBody.png
Panda;fmarkPandaBody.png
Thylacene;fmarkThylaceneBody.png
Foreleg Fade;fmarkLegfadeBody.png
Boots;fmarkBootsBody.png
Basic Stripes;fmarkBasicstripesBody.png
Biohazard;fmarkBiohazardBody.png
Feline Head:
Spades;fmarkSpadesHead.png
Clubs;fmarkClubsHead.png
Hearts;fmarkHeartsHead.png
Diamonds;fmarkDiamondsHead.png
Joker;fmarkJokerHead.png
Classic Tabby;fmarkCTabbyHead.png
Mackerel Tabby;fmarkMTabbyHead.png
Ticked Tabby;fmarkTTabbyHead.png
Spotted Tabby;fmarkSTabbyHead.png
Bicolour Tabby;fmarkBTabbyHead.png
Tuxedo;fmarkTuxHead.png
Gryphon;fmarkGryphHead.png
Gryphon 2;fmarkGryph2Head.png
Creature;fmarkFrankenHead.png
Blush;fmarkBlushHead.png
Blaze;fmarkBlazeHead.png
Zira Stripe;fmarkZiraHead.png
Dots;fmarkDotsHead.png
Panda;fmarkPandaHead.png
Biohazard;fmarkBiohazardHead.png
Feline Tail:
Spades;fmarkSpadesTail.png
Clubs;fmarkClubsTail.png
Hearts;fmarkHeartsTail.png
Classic Tabby;fmarkCTabbyTail.png
Mackerel Tabby;fmarkMTabbyTail.png
Ticked Tabby;fmarkTTabbyTail.png
Spotted Tabby;fmarkSTabbyTail.png
Bicolour Tabby;fmarkBTabbyTail.png
Creature;fmarkFrankenTail.png
Biohazard;fmarkBiohazardTail.png
Canine Body:
Dapples;fmarkDapplesBody.png
Appaloosa;fmarkAppaloosaBody.png
Creature;fmarkFrankenBody.png
Herring Bone;fmarkHerringBody.png
Fading Rings;fmarkRingsBody.png
Dots;fmarkDotsBody.png
Stockings;fmarkStockingsBody.png
Timber Wolf;fmarkTimberBody.png
Thylacene;fmarkThylaceneBody.png
Foreleg Fade;fmarkLegfadeBody.png
Basic Stripes;fmarkBasicstripesBody.png
Biohazard;fmarkBiohazardBody.png
Canine Head:
Creature;fmarkFrankenHead.png
Blaze;fmarkBlazeHead.png
Dots;fmarkDotsHead.png
Timber Wolf;cmarkTimberHead.png
Biohazard;cmarkBiohazardHead.png
Canine Tail:
Creature;fmarkFrankenTail.png
Biohazard;fmarkBiohazardTail.png
Try following my tutorial to add them into your markings.cfg file
http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&topic=21635.0