I can't think of a good reason to try, but if you insist: There's stuff called self-vulcanizing rubber tape, which can be wound on as a base. After that you could wrap the bars in colorful strings or whatever. Make sure that whaever you put on there stays on well, as grips coming off while riding could lead to serious trouble.
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If the old ones are worn out or damaged the easiest way is probably to cut the old ones off. If you have an alloy bar, try not to cut all the way into the metal.
The new ones can then basically be slid on.
You might need something to act as a lube to get them the whole way on.
Some use water, which is always accessible but takes awhile to settle.
Other use hair spray, which also takes some time to settle but acts as a glue once it's dried and really locks the new grips in place.
I prefer compressed air. I push the grip on as far as it goes, then use a basic blow nozzle aimed in between grip and bar. The air will form a layer between grip and bar which'll allow the grip to slide the rest of the way on.
Do note that using compressed air tools is potentially dangerous, so don't use that unless you're aware of what you're doing.
If I haven't got compressed air I use methylated spirits or rubbing alcohol. Pour some in the grip before you slide it on. The alcohol will evaporate faster than water, giving you the opportunity to get back on the bike sooner.