Replace the Default Anonymous Avatar on Blogger Comments
Step 1. Go to Dashboard - Template - click on the Edit HTML button
...click anywhere inside the code area and open the template search box by pressing the CTRL + F keys
Step 2. Type or paste this code in the search box, then hit Enter to find it:
</body>Step 3. Just above the </body> tag, add the following code:
<script src='http://code.jquery.com/jquery-latest.js'/>Step 4. Save the changes by clicking on the Save Template button
<script>
$("img[src='http://img1.blogblog.com/img/anon36.png']")
.attr('src', 'https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiF4JoTBrpGCpX1oX21wy5bhyphenhyphen5nDZ1i1y-YGnSLzRzXcLG3yWSohGK55x1YEMxsxCB1xdXzSYQuksoyUSjMC4HHqoxImBBxl6neMPCv48iMVDNXmm7omf-fOk7s1V1rISr6wqBQ30tUbwk/s1600/default_avatar.gif')
.ssyby('blank')
</script>
<script src='http://code.jquery.com/jquery-latest.js'/>
<script>
$("img[src='http://img2.blogblog.com/img/b36-rounded.png']")
.attr('src', 'https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjLqoStS941KtxSOMWqtjNYnBOik6WvyzNjIoUOY4VldEyvg53W_CKn4X4IqmhSuikDL1qi-nuihe2gLOIULGPRaH90rfcAjOlkmB-I0sjFEkyVwv6EruxMeKhhgRgL_20mib0-EI9s8P8/s1600/blogger-user.png')
.ssyby('blank')
</script>
Changing the default avatar
For Anonymous users: Replace the code in red with your image addressFor Blogger users: Replace the URL in blue with your own.
You can choose an avatar from here and then copy the url of it:
https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiF4JoTBrpGCpX1oX21wy5bhyphenhyphen5nDZ1i1y-YGnSLzRzXcLG3yWSohGK55x1YEMxsxCB1xdXzSYQuksoyUSjMC4HHqoxImBBxl6neMPCv48iMVDNXmm7omf-fOk7s1V1rISr6wqBQ30tUbwk/s200/default_avatar.gif
https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhFIDrtdJXI99OXgBZ-Rq5e6ju-VCD5OGYTegPmbknH_9LDvZrHf8QqF4Ax8y1cMroIEelcQmrABmgIzxM1WoRu7z5gbCoEt41uIgty3mbBeWsU8b_i6lSqOAEDuHxebey4FsSGSrlwIEc/s1600/facebook.gif
https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgcSW-kcAXORKm9xIu6FK-ojkTmYCAM9FE322mdia43Jgah8BEBlI0RHQFAAtyiJ_AcXDbxS_Fywkrun7VRh_0GFQJaLLqY9CnFumykojSjjGMZ1vXRmTIm3yVzkQBNuhxMYwonqgVxhdw/s1600/anonymous3.png
https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgtZYIexWpY95-mUk31RQad2qJlql9bETUQ_1htezV8Qo8Q05Kbt-Eu8sV6KExfV1it2R9sflTpuFibrjjJpg2eVxatSEF8txMDZfJzDYHGezd9U58Axmxg6CTcPXlMavvlFyYsorBKfTq0/s1600/blogger-user.png
That's it! If you found this trick useful, please consider sharing it.