How can I make a dyi case for my LG galaxy 6 phone?

I made a cover for my e-reader out of quilted material several years ago. Pick out a bright print pre-quilted material at the fabric store and cut 2 pieces slightly larger than the phone to allow for seams. Finish the raw edges on one short edge of each. Then place right sides together and sew around the other 3 sides. If you want to make a closure, you could add a button and an elastic loop at the opening.

I've seen others make cell phone cases out of a balloon. Here's how

http://www.dailymail.co.uk/news/article-2854057/Here-s-turn-ordinary-balloon-smartphone-case-just-10-seconds

HTH

A quilted or padded cosmetic bag may be a good idea for you. If it is not already bright enough, you can add neon washi or vinyl tape to grab your attention. I have an iPhone 6 and I have two rubbery plastic covers on my phone, plus a plastic glass protector on it. I am pretty clumsy, but I haven't broken a phone yet by dropping it. Best wishes 😇

I saw a neat one where you cover your phone in foil or a plastic and make one out of hot glue melted on

Check out Unicorn Spit....it is a stain/glaze that you could apply to the case. There are great colors to play with...and you will get addicted to "spitting" on all sorts of things.