Make your own NEW devil fruit!

[SilverShadow]

y swim swim fruit the most useless even if it works your just like a normal human but it would be funny if it dident work

the oposite of blackbeards logia light or a shadow logia

[nguman]

The Ngu Ngu No Mi, the fruit that enables you to be Nguman (which is quite awesome if you ask me)
The Hokuto Hokuto Fist fruit, the ability to make everyone explode by hitting their vital points.

[SaA]

The Ban Ban fruit eating this fruit will get you banned

[Anaztazioch]

Most usless fruit, Gaze-Gaze no mi
Allows you to see up to 5 miles underwater

[FreedomWing]

inu inu no mi turns u into a dog...

Just some ideas I thought up today.
I was looking for a forum with this kind of topic to throw 'em on.

funny ones:

Logia
Ale Ale/ Beer Beer Fruit- get's people drunk lol
Scent Scent Fruit- makes people stink sneeze, basically become an aroma
Powder Powder Fruit- makes the user into flour, weak to syrup (converse of that dude in the 4th one piece movie), people sneeze
Paramecia
Love Love Fruit- turns into something the opponent loves the most, but only an illusion not like mr. 2 who was for real
Chew Chew Fruit- user spits out whole gumballs with labels on them depicting what (powers?) the new chewer will get- kinda like Wapol

serious ones- as serious as one piece is --

Logia
Mercury Mercury Fruit- poisons you, liquid
Mirror Mirror Fruit- makes jagged glass weapons, gets shattered and goes back together, has a "you'll get bad luck" taunt, PLUS makes a 'negative' copy [reflection] of opponent for opponent to fight against
Chrono Chrono/ Loop Loop Fruit- can't stop or slow down time like Foxy, but can do all other time manipulations like rewind, logia because restores back to when he/she was undamaged
Sea Sea Fruit- controls sea water, ocean sea water has same effect on user, but self-generated water affects other DF users too
Gold Gold Fruit- made of bendable gold; like gold, it is not hard (making it different from mr. 1) but it's very heavy- so the user can hit hard, if all else fails bargains away body made coins for mercy

Paramecia
Key Key Fruit- open anything (including minds-think Psychonauts)- but can't make doors like Blueno
Shape Shape Fruit- become any shape to increase physical ability, like star, triangle (triangles in bridges make them stronger), square- actually this has potential to be really funny when used, also any body part can change seperately

Zoan
Splinter Splinter (for logia)/ Tree Tree Fruit- Yeah I know it's a plant, but why not?
Bug Bug/ Insect Insect Fruit- Has there been a bug man yet??

gross one:

Logia
Bug Bug/ Insect Insect Fruit- alternatively, cloud of bugs could be a logia person and reform after evading an attack, plus squished bugs are eaten by other bugs and then new bugs hatched to replace squished ones!! :P

[BlazeCommanderASCE]

^omg thats some creepy ones xD
how bout LieLie no mi, that makes your lies believeable? Usopp and Chopper sometimes lack the fruit... oh wait chopper already has one...

[Anaztazioch]

baka baka no mi -> turn you into NAruto lol

[Rancor]

Mario-Luigi fruit- you can turn into an Italian Plumber who gets off to shrooms

[the happy emo]

the rosi rosi friut which lets u control blood