I made a cake that is being picked up today and will be transported about and hour away. The cake has stars coming out of the top (in my albums) and a regular cake box wasn't going to work. Usually I get boxes from my office and use those for taller cakes but we didnt have any deliveries this week. I went to Home Depot and bought one of their moving boxes. I was perfect. Tall enough that it didnt hit the stars and is very strong and solid.
The box was new and clean but would it turn you off to see the cake in a Home Depot box. I would love to use them more often, the price was right and they are very sturdy.
Get some contact paper and cover them in a nice print. Honestly it would bother me a bit if I wasn't into caking, since I am it wouldn't but you know what I mean.
I'm with revel. It wouldn't bother me. In fact I might feel like you went out of your way to get a sturdy box for me (the home depot box, definitely not a product box).
If you knew they were taking it to a venue, I would cover it nicely and somehow put your business logo on it, but not to a home.
Kathi
I would probably cover the inside with foil and use non-skid liner underneath the cake just to be on the safe side. As others said, I would be glad you put my cake in a sturdy box! I have bought "cake" boxes and they are so flimsy that if you don't support them with two hands, you will be in trouble (yes, my cakes are on cake boards).
Thanks ladies.. I did put the shelve liner under the cake.. I do that with all my cakes anyway. Next time I use one I will put the foil on the inside and contact paper on the outside.
I hate wilton boxes, we have a bakery here and I get my boxes from her a little sturdier but they are no where near big enough for the larger/tiered cakes.
I get potato chip boxes from my kids school on chip day for free...I use those for my smaller tiered cakes and 3D cakes.I use a piece of skid proof shelf liner so it doesn't move around.I have never had a customer complain or make any comments.I think as long as it is clean and not greasy or dirty looking I don't think anyone would mind.
On rainy windy days I place my tiered wedding cakes in Home Depot boxes too and I've had customer pick up tiered cakes in the boxes as well...no one has minded. It protects the cake and that's what matters.
I"m going to have to start doing that.... I was using the Domino sugar boxes from Sam's, they were the perfect size and shape and very very sturdy. Well I went today and they are changing alot of their name brands they use...and they have a new brand with flimsy smaller boxes now! 
I found a couple of the Domino boxes left and snagged two of them but not even sure if I have enough for this weekend's orders or not....
I get shiping boxes from staples. They are very sturdy. I would be weary of a box from home depot... dirt, bugs, etc. Though I suppose the same could be said from an office supply store. 
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