A little goes a long way.
Although there are no hard, fast rules governing the proper non-botanical ornamentation of gardenry, there are certainly a few guidelines I think we can all basically agree on:
1. Less is more.
2. Herds of fake deer? Not so much.
3. Tires, painted or otherwise: Skip it, dude.
4. Did I mention, apply sparingly?
5. There is really no situation in which a cartoonish lawn jockey is OK.
Here are a few examples from the Halcyon Garden. A few are almost tasteful. Others provide comic relief. You be the judge:
Related post: Tour the Halcyon Garden, if you dare.
The Greenery 
Rustic garden art adds so much texture and character to a garden. Nice photos.
Thanks! I kind of love my weird little collection: stained glass art made by Mom, cheesy but fun pagodas and generic Eastern wizened little men, Buddhas or all kinds, and a real fire hydrant, a gift from our crazy mechanic friend Kenny, who has 3 of everything. And of course, Otis the Cat, an immovable object.
The last one made me smile
Hmmmm, I notice the pink flamingo has been ditched!!
The flamingo is still here. But it’s nervous.
Makes me think I should break out one of my mother-in-law’s ceramic figurines she made during her pottery phase.