Because of this.
Unless you're handy and have a Lowe's or a Home Depot close by so you can make custom trays :)
This handy girl got a Lowe's employee to cut up a 1/4 plywood sheet (cost me just under $20) into chunks corresponding to the measurement of the washer and dryer tops minus about 1/2 inch on each side for wiggle room (the rest of the sheet was cut up into pieces that I'll be using for other projects). While I was there I also grabbed a few 1x2s for about $2 a piece.
Since I'm not a master woodworker and also kind of short on patience I decided to make the construction as easy (fast) as possible.
The markings on the bottom are made about 1/2 inch in from the edge to correspond to the middle of the 1x2s. Pre-drilled all my holes and assembled it all with screws and some wood glue here and there. Here and there only because I forgot to apply it everywhere :)
If you have more patience than I do here's where you should fill all the little imperfections with either wood filler or caulk. I did minimal prep by only sanding off the rough spots and then jumping right into painting. Two coats of a black house paint I had on hand. Since I didn't prime it almost looked like a black stain when it was dry because the wood soaked it all up. Pretty cool look. However, I needed these to be wipeable when done so I coated them in polycrylic. And added the cabinet pulls found at Walmart for about $3 a pair. Oh, and the felt furniture paws underneath so as to not scratch the machines.
Sure, you see the imperfections when the light shines on them just right. Where they're situated not much light will hit at this angle, though :) It's all about faking perfection. What people don't see and don't know about won't hurt them (this goes only for decorating, pretty much everywhere else in life this philosophy will mess you up, ok? Just making that clear :)).
Now I have a light duty "countertop" with an elegant look. This formerly useless space has turned into usable space, either for decorative or practical purposes. They clean up easily. In fact, I can just pick them up and empty any debris into the trash or outside. Not to mention I can use them as trays in other places of our home, if needed.
Now I'll just keep working on making the machines "go away". I have a plan but I'm not telling yet :) I'll keep you posted as I make progress as usual so stay tuned!
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