I like to put Two ads side by side on my blogger. At first I thought is very difficult to put two ads side by side, but actually is very easy. Recommended Ad sizes:
The unit sizes which work Best when placed side by side are: 336x280 Large Rectangle, 300x250 Medium Rectangle, 250x250 Square etc. But you can also use 200x200 Small Square, 180x150 Small Rectangle, Skyscrapers, Link units.
Step 1: From your Blog Dashboard, Go to layout.
Step 2: Click on Add a Gadget and choose HTML/Javascript widget.
html javascript widget blogger
Step 3: Just copy this code:
Step 4: Replace ADS CODE 1 and ADS CODE 2 with the Ad unit code.<table width="520" cellspacing="0" cellpadding="0" border="0">
<tr>
<td width="250" style="padding: 5px;" align="center">
ADS UNIT CODE</td>
<td width="250" style="padding: 5px;" align="left">
ADS UNIT CODE</td>
</tr>
</table>
Step 5: Save the Widget and Done.