Step 1: Draw an angel outline onto Contact Paper and cut it out.
Step 2: Peel the paper off the Contact Paper and place it on your jar/vase. (My vase is from IKEA, which is a CHEAP place to get jars and vases in basic shapes.)
Step 3: Wearing protective wear, use a paintrush to brush a glass etching substance all over. Use a generous amount, and brush in multiple directions. I used Armour Etch. (I think it had lost some of its potency from being old, though.)
Step 4: Follow the directions on your etcher. (For mine, you just rinse it off in the sink! Easy as pie.)