Could you please recommend some Icons for my VB6 application?

Just keep looking until something strikes your fancy.  Or you can
download a free icon-making software tool and just put something
together yourself.

Try a site like one of these two:
[ http://www.icongalore.com/sales/purchase-and-download.php ]
[ http://www.coolarchive.com/icons.php ]

And here's an index of sites that offer free icons:
[ http://dir.yahoo.com/Arts/Design_Arts/Graphic_Design/Web_Page_Design_and_Layout/Graphics/Icons/
]

If you have no idea what will work, then maybe try asking your users. 
They'll have to look at your icon every day.  If nothing good comes to
mind, describe on this forum what your software does and maybe soemone
will have a really good idea for you.  Without knowing what your
software does, it's impossible to say.

You can also try:

Free Icons: http://www.vbaccelerator.com/home/Resources/Graphics_Library/index.asp

Icon Extractor (lets you extract them from other applications):
http://www.vbaccelerator.com/home/NET/Utilities/Icon_Extractor/article.asp

Stock Icons (if you like high end looking ones):
http://www.stockicons.com/