These graphics are by me:
graphics/images/ambient/sandstorm.png
graphics/items/equipment/chest/lightplatemail.png
graphics/items/generic/crystal.png
graphics/items/generic/easteregg-blue.png
graphics/items/generic/easteregg-green.png
graphics/items/generic/easteregg-pink.png
graphics/items/generic/easteregg-red.png
graphics/items/generic/easteregg-teal.png
graphics/items/generic/easteregg-yellow.png
graphics/items/generic/fabric.png
graphics/items/generic/hardspike.png
graphics/items/generic/ironore.png
graphics/items/generic/pinkantennae.png
graphics/items/generic/powder.png
graphics/items/generic/santacookie.png
graphics/items/generic/whitefur.png
graphics/particles/aniblaze-large.png
graphics/particles/aniblaze-medium.png
graphics/particles/aniblaze.png
graphics/particles/blaze.png
graphics/particles/bubble_8px.png
graphics/particles/bubble_12px.png
graphics/particles/bubble_32px.png graphics/particles/fog-medium-a.png
graphics/particles/fog-medium-b.png
graphics/particles/fog-medium-c.png
graphics/particles/glow-medium.png
graphics/particles/glow-small.png
graphics/particles/gloworb-medium.png
graphics/particles/gloworb-small.png
graphics/particles/orb-large.png
graphics/particles/orb-medium.png
graphics/particles/orb-small.png
graphics/particles/star-medium.png
graphics/particles/star-small.png
graphics/sprites/error.png
graphics/sprites/equipment/chest/lightplatemail-female.png
graphics/sprites/equipment/chest/lightplatemail-male.png
graphics/sprites/monsters/pinkie.png
graphics/tiles/icecave.png (based on cave.png)
graphics/tiles/woodland_indoor_x2.png
graphics/tiles/woodland_indoor_x3.png
graphics/tiles/woodland_indoor.png (with Meway)
graphics/tiles/Woodland_village_x2.png
graphics/tiles/Woodland_village.png
graphics/tiles/Woodland_x2.png (with Saphy)
graphics/tiles/Woodland_x3.png (with Len and Saphy)
These are by Saphy, IIRC:
graphics/tilesets/Woodland_x4.png
graphics/tilesets/Woodland_x5.png