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Using this CSS will make the new liquid threads more tolerable (at least to me).

.lqt-post-wrapper {
	border-style: solid none none solid;
	border-color: silver;
	border-width: 1px !important;
	background: #fff;
}

.thread-collapse-control > a {
	background: none;
	width: 10px;
	height: 10px;
	border: 1px solid silver;
}

Depending on how you apply it, you may need to include a few more !important tags, I tested it in Stylish on Google Chrome.