Yo
Races of Faerun 3.0 has the
Tattoo Magic item creation feat, single use tattoos that take up an item slot (or not, for twice as much), spell level x caster level x 50gp, max 3rd level. Craft pre-req. Activating a tattoo (must be touched) is a standard action that does not provoke AoOs. The spell
erase removes tattoos.
The
Players Guide to Faerun 3.5 has a 2nd level spell
Create Magic Tattoo, also uses Craft. This provides 24-hour duration buffs chosen from a list, limited by caster level and Craft DC.
As Oryan said, The
Book of Elemental Might I 3.0/3.5 has the
Graven One prestige class, which gives a caster the ability to
+tattoo herself with 'tattoos of power' chosen from a list of buffs (1/day);
+ use the BoEM I item creation feat Etch Object Rune on herself (spell level x caster level x 30gp, no level limit, no item slots, max 4 at once;
+ and tattoo herself with summoning runes, max 1.
Gains 5 levels of spellcasting over 10 class levels.
That's all I know

Alice