Which rainbow 🌈 items are actually worth grabbing? Any must-haves?

Now that rainbow items are easier to get, which ones are the best looking or most impressive?

Which Bodies? Decals? Wheels? Toppers? And if it matters Goal explosions?

Edit: —— Summery from research:

• Streak-wave decal is the only universal chromatic decal
• Flamethrower: thick enough and easily obtainable
• dueling dragons look decent