It's not a question of creativity (if it was, I'd propose something awesome). It's a question of what would fit with the current types available. (And there are technically 136 typings available atm, btw)

Radioactive - Radioactivity is a result of electric imbalances at the nucleus. (can be classified as Poison (due to effects on creatures) or Electric (because it's electric imbalances).
Nuclear - Nuclei are held together by very strong magnetic forces at the subatomic level. When those bonds are split, an enormous amount of energy is released. (Can be classified as Electric due to magnetism)
Light - Light itself is a type of energy wave that is of the "middle" wavelengths, varying from Red (lowest) to Violet (highest) (follow rainbow colors). It's a type of energy. It disrupts the bonds between atoms (not subatomic bonds mind you) and causes heat. It can be classified as either Fire (because of heat) or Electric (because of energy)
Holy - This is assumed: Game Freak does not direct religious ties. However, the Fighting-type already represents heros which is why Fighting is super-effective against Dark, the villians.
Storm - Wind and water. Flying or Water
Plasma - a form of matter at a higher energy state than gas. Electric.
Sound - One I could see working but they would have to change quite a few move types and (maybe) add some more types to certain Pokemon (not replace types. That has never been done before and it would be stupid to do so imo. Magnemite was Electric in Gen I, Electric-Steel in Gen II. They added a type, not replaced it)
Star - Stars are, well, stars. Fire or Rock.
Steam - Boiling Water is an attack now. Water.
Virus - Depends on the type of virus meant. Electric (Computer) or Poison (cold, flu, etc.).
Sonic - A fancy word for Sound. See Sound.

Magic - No.
Time - Dialga is fine at Dragon/Steel and Celebi at Grass/Psychic.
Crystal/Glass - Minerals. Rock.
Heart - Wut.
Wind - Flying. Or Electric due to energy that causes wind.
Space - No.
Wood - Grass.
Fossil - Rock.
Ceramic - Ground or Rock.
Magnet - Electric.
Food/Culinary - Grass or xxx/Fire (xxx being any other type with Fire to cook it)
Caustic/Acid - Acid is a Poison move. Poison.
Virtual/Digital/Cyber - Porygon line says hi. Normal or Electric.
Capital/Institution - What is this I don't even.

Aura - Not really explored but is similar to Psychic abilities. Psychic.
Bird - MISSINGNO WTFBOOM. Replaced by Flying in Gen I.
Dance - Dance is something that all living things should have a grasp of, even if its used for different purposes. Normal.
Zombie = Ghost covers death and spirits. Ghost.
Plastic - Fire or one of the mineral types.
Cloth - No.
Speed - Yes, because a stat needs its own type.
Air - See Wind.
LOVE - See Heart.
Cosmic - Uh, no? Cosmic is basically every element found here on Earth, minus life.
Paper - is made of plants. Grass/Water or just Grass.
Reptile - Dragon.
Mystic - Wut.

Now, onto what I said earlier. Poison needs rebalancing to make it SE to the things it should be SE against. What does Poison do to living things? It kills them. Insecticides and such. SE to Bug and Fighting and maybe another of the 14 other types.