I have a flat one with some bicentennial thing on it. It's holding a plant. The cheapo plastic one is back in my mom's "spare ashtray" collection. The odd one that is shaped like a slightly curved athletic cup with a "divider" down the middle... that's on top of my alarm clock waiting for a use. I just can't part with it. It makes me laugh.
I have many...One is used for change when I get home, one sits on the bar for empty carto's that need filling (cracks me up that it still looks like an ashtray. One by the bar sink for carto's that need cleaning (or driptips or tanks or the occasional dripper bottle.
I still keep my favorite little ashtray on the coffee table, and use it as a rest for my PV... After over 40 years of smoking, it really is a conditioned reaction (kinda like Pavlov's dogs... ha!), so every time I go to reach for a "cig"... I find my PV there instead!!
I also have another one by my computer that I use as a rest for my P/T when it's not in use...