You can have items have different colors!
Just use 5 different numbers in those collumns I used "ID,3,45,147,146,148" for this.
Or if your enchant is a orbs swirling around your item; normally if you do an enchant swap; you'll get 5 orbs swirling around your item. Well, I think that's cool but in case you don't like it and just want one orb around your item you could solve the problem here with no problem.
ID, 142, 142 , 142, 142, 142 - 5 Orbs
ID, 0 0, 0, 0, 142 - 1 Orb around the tip of the blade
I hope everything is clear now what you can do with those DBC's...
So now I'll give a list with most effects you could get on your weapon. I'll give ID (as used in ItemVisualEffects.DBC) a description and sometimes followed by a picture.
2 - Blue Glow
3 - Blue Glow
42 - Orbs orbiting around the weapon; see last picture for example
45 - Red Glow
46 - Poison dripping from your weapon
47 - As if you applied a sharpening stone
48 - Yellow Glow
49 - Looks like a rune glowing on your weapon (looks like Arcane Intellect buff)
50 - Weak evil red glow
51 - fireball(s) orbiting around your weapon
52 - snowflavkes around your weapon
62 - Blue Glow
81 - boulders around your weapon (like shaman enchant I think)
101 - Some shining white orbs around your weapon
121 - evil red glow
124 - white glow
145 - green glow
146 - purple glow
147 - yellow glow
148 - shadow glow
149 to 152 - colored orbs around your weapon; in right order: purple green red yellow
153 - lightning, picture:
159 - picture:
160 - chaotic fel fire enchant:
161 - Looks like druid's faeri fire above your weapon
162 - weapon is launching fireworks
164 - just check it out
170 - smoke above comming from your weapon
171 - lightning, check example at top of the thread
174 - thundercloud above your weapon
177 - gold glow
Some real enchants (check wowhead to see how they look if you don't know)
182 - mongoose
183 - savagery
184 - soulfrost
185 - sunfire
186 - battlemaster
187 - spellsurge
194 - executioner