There are lot of examples that uses cloud architecture for their applications like:

1. Processing Pipelines: uses like document processing pipelines that convert documents of any form into raw searchable text.

Image processing pipelines – create thumbnails or low resolution image

Video transcoding pipelines – convert video from one form to another online

Indexing – create an index of web crawl data

Data mining – perform search over millions of records

2. Batch Processing Systems

Systems that uses log management or generate reports.

Automated Unit Testing and Deployment Testing

3. Websites

Instant Websites – websites for conferences or events

Promotion websites