Going for a streetfighter build? Be cool to see when its done. And, if by coolant "tubes" you mean hoses, just find some large diameter wire loom or corrugated pipe sleeve in whatever color you want. Just be sure to buy something that would tolerate the heat ( +/- 240 degrees minimum ) and buy the right size, if its loose it could wear holes into your hoses. I've seen anodized aluminum pipe sleeve on some custom cars, looked pretty trick. Not sure where it was bought, but let google be your friend and check out custom accessory suppliers. Good luck on the build!