God I hate when that happens.
I have a red hatchback Prius, and not only does it look like every other red hatchback, it's so small that it gets swallowed up by the parking space.
I don't know how many times I was convinced my car was missing, then kept walking and found it hidden between 2 normal size cars. Don't get me started for when it's parked next to an SUV.
For it's small size, I can fit a metric **** ton of stuff in it.
The market I go to most has 3 foot tall concrete fruits and vegetables in front of it, every few feet. I try to note if I'm parked in the aisle that starts with the aubergine or the artichoke.
Also, if I'm in a crowded parking lot, I'll take a picture of the nearest parking lot number, so I'll know where I should look. Works really well.