How should Buddhists receive generosity? There is a lot of advice about dana and the importance of generosity and giving but is there any advice on how to receive generosity? From a western perspective it can be quite awkward to receive gifts or charity so I wondered if there is any specific Buddhist advice on how should this be done - both the actions and the appropriate mental state.

The motivation for this is this you tube video where Yuttadhammo is receiving alms. I found it very striking the manner in which they are received - without any thank you or speech. This could be a cultural phenomena within Sri-Lanka or how alms are received generally - I'm not sure. However it makes me wonder in what spirit generosity should be received from a Buddhist perspective generally.
The lay community consider it a privilege to offer Dana to monks. A monk is a special person who has given up the comforts of lay life in search of spiritual liberation. Offering Dana to such a being is very meritorious(refer to Dakkhina Vibhanga Sutta). So the monks are actually doing a favor to the laypeople by accepting it. When going on alms round, a monk may give a short blessing, but it is not compulsory. If monks are invited to a house to receive the dana, they will usually give a sermon on invitation.

From a monk's perspective, being worthy of it is the spirit of receiving generosity. In the Aggikkhandopama Sutta, lord Buddha explains what happens to the monks who are not worthy of the gifts received.

From a giver's perspective, the receiver needn't have any standards. You can even give food to an animal and expect a 100 fold gift in return, according to Dakkhina Vibhanga Sutta. The more virtuous the receiver, the greater the merit. 

Generally, from a receiver's perspective, rather than just thanking as a common courtesy, it's more important to remember the favor and return the kindness as one is able when one gets the chance. SACCAṀKIRA-JĀTAKA gives a good example. Also, one can try to make the best use of the gift received to make the giver happier.