Picture of Faux Chipped and Rusted Enameled Metalwork
Whether or not your piece is made of metal, you can create the look of old enameled iron that has chipped and rusted. This is great for new metal pieces, statuary, clay pots, or anything you can think of. It only takes some spray paints, rock salt, and a soft paint brush.
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Step 1: Supplies

Picture of Supplies
Your decorative piece: small statue, resin wall hanging, etc..
Matte finish Brown spray paint
(optional) oil-based hobby paints in matte rusts, browns, reds, and yellows
Gloss spray paint in desired finish color
Gloss clear spray paint
One small detail paint brush
Rock salt
One soft painbrush (old cosmetic brushes work here too)

Step 2: Rusty Undercoat

Picture of Rusty Undercoat
Basecoat your piece in the brown paint.
If you wish to have a more detailed or old looking rust effect, you can accent it by mixing together various shades of brown with reds and yellows. Look at some photos of old rusted objects as a reference. Using a fairly dry brush, dab the shades of brown randomly in areas where you want the rust to show.

Step 3: Placing the Rust

Picture of Placing the Rust
Once the rust basecoat is dry, dip a small paint brush in plain water and dab areas you want the rust to show.
Before it has a chance to dry, sprinkle salt in the wet locations, brushing away excess as soon as possible. Alternately, you can lay piles of salt in places where you want the rust to show and then use a brush, toothpick, or your finger to drop small amounts of water onto the salt. The wet salt will bind lightly to itself and mold itself along the surface and help it stay in place a little better. Let the water dry.
This is a nice technique, I like the tile you started with too.