Вот так, например:
<div class="b-blocks">
<div class="b-blocks__item">
<div class="b-blocks__item-inner"></div>
</div>
<div class="b-blocks__item">
<div class="b-blocks__item-inner"></div>
</div>
<div class="b-blocks__item">
<div class="b-blocks__item-inner"></div>
</div>
<div class="b-blocks__item">
<div class="b-blocks__item-inner"></div>
</div>
</div>
.b-blocks {
background: #fff;
padding: 20px;
width: 800px;
&::after {
content: '';
display: table;
clear: both;
}
&__item {
float: left;
box-sizing: border-box;
width: 48%;
height: 300px;
padding: 10px;
margin: 1%;
background-color: gray;
background-image: repeating-linear-gradient(45deg, transparent, transparent 35px, rgba(255,255,255,.5) 35px, rgba(255,255,255,.5) 70px);
&-inner {
width: 100%;
height: 100%;
background: #fff;
}
}
}
https://jsfiddle.net/hyjra7j8/6/