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AlternativeTextures
Framework which allows for placeable objects, buildings and entities to have texture variety in Stardew Valley.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Content Patcher actually comes with a full guide on what its features do, and I believe it includes a section that lets you only make a change when it’s a certain season. Take a look through it if you haven’t already, and I can (hopefully) answer any questions you might have!
For furniture, Alternative Textures has very detailed guides and this mod has recolored almost every piece of furniture, so it's a great starting point since you won't have to worry about stuff like furniture size, you can just edit what you need.