I feel so silly to post this, but I'm trying to redesign my bumbus' pet page and I've been fiddling with the code to all of Subeta's menu stuff so I can customize it more. But that silly blue bar and random horizontal line I can't seem to figure out where in the code it is and how to get it to go away.

Help!

That blue bar seems to actually be a somewhat-rosy tan color to me. After looking at the source code for your pet's page, I'm guessing that color is there because it's just using the default background color for Subeta due to not having the background color specified. In the code that specifies the style using CSS, the background is currently set to "none":
,,,,, ,,,{ background: none; }
Is that blue the same color you have around the edges of the page when browsing Subeta? If so, that'd confirm my guess. If I'm right about the reason for the blue color, then the fix would be easy; just specify a background color.
As for "random horizontal line," I'm not sure what you mean. Could you clarify that for me?
I shouldn't have said 'horizontal rule', I should've said that random verticle line where the bookmark item would go. Would it be in my best interest to remove hr rules?
And I tried the background element and it sadly didn't do anything. :C And yeah, it the sidebar menu on the left.

Moving to Profiles & Graphics Discussion!
Thank you for the move! I didn't realize this could be discussed there.

Oh you. :P Letting me take care of this, are you?
The blue (in your case) bars are background-color showing through. This should fix that.
body, { background-color:; }
I suggest you also add this (removes a line in the morostide layout)
{ border:0px; }
You may also want to remove the footer. ^^
Yes well.