Excited about the "I" inverting tiles, I modified my tileset so that the letters when inverted look like stone with a shadow of a letter on it. I then decided which stones would be represented by which letter, used ground and grass tiles for soil, and the inverted smoke,fog,stone textures for metal ores. I changed all the values in stone*.txt and generated a new world.

I discovered that "I" does nothing in the raws, it only works in init files. Walls still look good though except for loam sharing the same symbol for ground I can walk on!

Credits - I used every tileset from everyone that allows modification of their tileset, If it sounds impossible, I added every tileset as a layer in gimp resized, generated the optimum palette while they were still seperate layers, I then depth merged them all together to get a good idea of which graphical tiles i should put where(this was when I was still new at this). I then modified the tiles one by one pixel by pixel, going with what seemed to be the most common use for each tile. I used trees from 7x7 graphical tilesets arranged in patterns I knew how to make from making ultima clones. Over time I changed it for the newer feature of DF, but I kept some tiles that I liked, ] - used to appear on my city maps I made it a building that matches up with two others to make a castle.

No resizing neccesary: 16×16 tilesets
2.1 Aesomatica
2.2 Anikki
2.3 Anno
2.4 Bisasam
2.5 Cooz
2.6 Guybrush
2.7 Herrbdog
2.8 Inquisitor Saturn
2.9 Kaishaku
2.10 Kelora
2.11 Klokjammer
2.12 Marble Dice
2.13 Nordic Curses
2.14 PTTG
2.15 Random832
2.16 Raving
2.17 Red Jack
2.18 Sappho
2.19 Savok
2.20 Super Foul Egg
2.21 Tahin
2.22 Tyrving
2.23 Winterwing
2.24 Yayo
2.25 Zaratustra
3 16×16 tilesets for edited raws
3.1 Belal
3.2 Darkond Digs Deeper
3.3 Dwarfletter
3.4 Flying Mage
3.5 Gold Plated
3.6 hermano
3.7 Isenhertz
3.8 Lemunde
3.9 Martin
3.10 Phoebus
3.11 Phssthpok
3.12 SL
3.13 Spreggo
3.14 Synergy
3.15 The-Moon
3.16 Tigrex
3.17 Tim's
Trees/Walls for city,fortress,tower from: Tiny tilesets
5.1 Geti
5.2 Herrbdog
5.3 Kein
5.4 Lord Nightmare
5.5 Madk
5.6 Markavian
5.7 Nobbins
5.8 Terbert
5.9 Thief^
5.10 Zaratustra
Resized to fit:
1.1 Anikki
1.2 Alloy
1.3 Bisasam
1.4 Cheepicus
1.5 Ddw
1.6 DDR
1.7 Dorten
1.8 Gekz
1.9 Hanuman
1.10 Haowan
1.11 Herrbdog
1.12 Jdpage
1.13 Lord Dullard
1.14 Lord Nightmare
1.15 Maus
1.16 Markavian
1.17 Nagidal
1.18 Paul
1.19 Savok
1.20 Sir Henry
1.21 Taffer
1.22 Talryth
1.23 Teeto_K
1.24 Terbert
1.25 Tocky
1.26 Turnip
1.27 Unknown
1.28 Vidumec
1.29 Xenomorph
1.30 Yayo
1.31 Zaratustra
4.1 Andux
4.2 CKY
4.3 Coaldiamond
4.4 Eagle of Fire
4.5 Inquisitor Saturn
4.6 Kein
4.7 Lord Nightmare
4.8 Lumin
4.9 Nobbins
4.10 Plac1d
4.11 Quietust
4.12 Sergius
4.13 Shaja
4.14 Tae
4.15 Taritus
4.16 Thom
4.17 UncleSporky
4.18 Xenomorph
4.19 Zaratustra