I did some research on the net (i.e. googling) => I found 2 solutions:
- The first solution is exactly what I was looking for. Thank you, Jorge!
Of course, there's also Digg's solution but it's not very straightforward to find - I mean the thing that I wanted with the button seems quite difficult to find. I found it on their website only when I knew what I was looking for. However, they don't say exactly how to integrate this with blogger: I have searched quite a bit on digg.com and I'm quite sure that they don't say anywhere on their site the exact specific way to integrate digg with blogger - I mean the exact specific information as I needed and Jorge's blog provided.
The funny thing is that googling digg for the exact integration with blogger only offers results about digged web pages and none from Digg Help. - The second solution I found is for adding digg buttons to individual posts. I haven't tested that, because I didn't need it and also I don't have access to a server where to store that html file they're creating as a workaround.
Hope this helped anyone trying to add a Digg yellow button on their website!
P.S.: Now guess who's the first one to digg my personal blog! Yes, obviously, it's me!
P.S.2: Yes, yes, I know and I've read that technically they don't accept non-English digged links, but hey! it would be a real shame not to promote those posts I wrote about my traveling in Romania.