#blokas {
background-repeat: no-repeat;
width: 700px;
height: 600px;
}
#paskutine {
background-image: url(img/paskutine.png);
background-repeat: no-repeat;
width: 429px;
height: 412px;
float: left;
}
#skype {
background-image: url(img/skype.png);
background-repeat: no-repeat;
width: 254px;
height: 216px;
float: right;
}
#reklama {
background-image: url(img/reklama.png);
background-repeat: no-repeat;
width: 253px;
height: 186px;
float: right;
}
<div align="center">
<div id="blokas" >
<div id="paskutine" ></div>
<div id="skype" ></div>
<div id="reklama" ></div>
</div>
</div>