Welcome to Workshop. Many thanks for joining the community and for making your first post.
I take it you are interested in buying some new blinds and want some recommendations? Perhaps you could share a photo of the room you want to install them in, let us know your location and a little bit more about your needs? I'm sure the community would be keen to assist with some suggestions and advice.
This should help - http://www.bunnings.com.au/our-services/in-home/custom-blinds/indoor-blinds
@Teep Bunnings also offer a cut to measure service for some of the blinds that they carry in store. Also the length of a blind is referred to as the "drop" which will help you when enquiring about sizes.