Michael,
I think Darryl's asking more about the physical logistics rather than care or attentiveness to the props.
I use color as much as I can for maximum contrast within the confines of my performing venue. Ren Faires tend to frown on neon pink
tending more toward earth tones. Rich colors like purples and reds are "reserved" for nobility and would not be appropriate for a performer of my status.
I wear black robes and either a black vest (doublet), or without the vest, a white shirt (as seen in my Avatar) so the color and positioning of props is important to me.
Rather than using a black or other dark work surface, I have a light beige table top so other dark items contrast nicely and are more visible while on the table. Coins are shiny gold or silver dubloons, silks are usually white, smaller "TT" silks are of course red or blue. Cards (seldom, but if I do) are large size, brightly colored Tarot cards appropriate for the period (as long as there are no historians present).
Anything I can do to create visibility is what I go for. Out of necessity, some of my props are dark colored, so I have to present them out and away from my body when holding them (they still look good on the light table though)
I have an extra tall "waiter's stand" table base that positions things several inches above my waist so when I do things like Cups and Balls, the cups when lifted are naturally chest high. This is the only thing I do behind the table, otherwise I step around front and perform chest high and "in the round" with arms spread for all to see.
Of course, this is in a Ren Faire setting and may not be appropriate for your venue so YMMV
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