Fantasy
I used to alter Magic the Gathering cards. I loved the imagination prompt of the existing artwork, and the challenge to copy the styles. Mana were my favorite, of course. Most of these are cards from private players.

Swamp

Swamp

Colorful Swamp

Misty Swamp

Swamp (inspired by Rebecca Guay)

Forest Landscape

Plains

Island (inspired by Rebecca Guay)

Island

Coastal Island

Mountain Landscape

Mountain

Mountain
Island

Forest (inspired by Rebecca Guay)

Forest
Kemba, Kha Regent
Daretti, Scrap Savant
Ishkanah, Grafwidow
Ashiok, Nightmare Weaver
Oloro, Ageless Ascetic
Glissa, the Traitor
Saheeli Rai