I love turning discarded bottles into decor. There is no right or wrong way to alter your bottle. It's a matter of taste.
For example, I have a friend who loves shabby chic. When I alter a bottle for her, I use lace, tulle and embellishments that lend themselves to a soft, feminine look.
You can often find cheap lace, buttons and costume jewelry at yard and garage sales, so keep an eye open.
What you need
Your supply list will depend on how you decided to decorate your bottle. For example, if your bottle has a flat front, you might choose to glue a photo or ephemera to the front.
Here are the items I have on hand when altering a bottle.
Mod Podge (to decoupage)
Embellishments (see list below)
Embellishments to consider
Strings of beads
Styles/themes to consider
French inspired (Think Paris)
Another way to alter a bottle into perhaps a more useful item is turning it into a soap dispenser. I love using Crown Royal and Chambord Liqueur bottles. I've made several for gifts and the recipients loved them.
You can buy the soap dispenser pump at a craft store or online. I like to spray paint my pump using Rust-oleum American Accents Satin Metallics Classic Bronze. With the bottles I use, I think a bronze pump looks best. But it's totally up to you!