Well, everyone has different tastes when it comes to looks. You can google search pictures of raised beds to get a lot of good ideas. For myself, my preferred pallet wood raised bed is what I call my pallet wood raised bed v2.0...
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There are several advantages to the v2.0 design. Notice that the outside 4X4 foot 2X4 framing is using the complete pallet wood stretcher with the notches. That makes it faster to put together with no cutting. The corners are then filled in with scrap 2X4 pieces that are 16 inches tall. That ties the outside framing together and sets the height of my raised bed.
Then I add the pallet wood planks, cut to 16 inches max length, on the backside of the 2X4 framing. When filled with soil, it pushes the sidewall planks out into the 2X4 frames. I will not have any sidewall blowouts that you will eventually get if you put the sidewall planks on the outside of the frame.
Also, because I use the 2X4 framing on the outside, I can actually use shorter pieces of pallet planks down to about 10 inches because I just fasten them behind the 2X4's. That allows me to use up a lot of shorter scrap pieces of lumber if I want.
As far as looks, I try to stagger a light wood, then a dark wood, then a light wood.... I think it looks pretty good, but obviously I am biased in my project builds.
One thing I started doing last year was dumping my scrap pallet wood cutoffs into the hügelkultur layer of my raised beds...
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Wood is wood. Usually, I use logs in the bottom and fill in with the smaller scraps of pallet wood cutoffs to fill the voids. In any case, it's a great way to get rid of smaller pieces of wood that I don't plan on using for anything else.
Dear Wife wanted to grow some Asian Bitter Melons which climb up a trellis like cucumbers. So I found some reclaimed 2X4's and built a trellis frame...
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I later added some 2X4 wire fencing for the plants to climb up on.
Well, I understand about being stuck inside the house. Tonight's low is going to be about -24F. Today's high forecast is +3F. All I can do is watch YouTube videos and maybe get some more gardening ideas for this spring.
In any case, I look forward to seeing what you build for your raised beds. Please post some pictures when you get a chance.